Cyber Monday Sale On California King Size Memory Foam Mattresses

Shop California King memory foam mattresses for Cyber Monday, with body-contouring comfort and extra length for stretching out. Compare prices and product details in the selection below to find a mattress that fits your sleep preferences, space and budget.

Sleepy's By Sealy Memory Foam Medium Mattress

3591

Starting at

$589⁹⁹

$889⁹⁹

$300 OFF

Medium Comfort, best for

Back, Side, Stomach Sleepers
Pain
Bed Partner
Toss and Turn
Temperature

Serta Perfect Sleeper Sleep Excellence Medium PillowTop Mattress

1470

Starting at

$1999⁹⁹

Medium Comfort, best for

Back, Side, Stomach Sleepers
Pain
Toss and Turn
Temperature
Bed Partner

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest Silver BRS900 11.75" Extra Firm Mattress

3341

Starting at

$1699⁹⁹

Extra Firm Comfort, best for

Back, Stomach Sleepers
Temperature
Pain
Allergies
Bed Partner
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest BR800 11.25" Firm Mattress

2261

Starting at

$1299⁹⁹

Firm Comfort, best for

Back, Stomach Sleepers
Toss and Turn
Pain
Bed Partner
Temperature

FREE ADJUSTABLE BASE ³ with code ELEVATE

Stearns & Foster Estate 14.5" Firm Mattress

1867

Starting at

$2899⁰⁰

$3099⁰⁰

$200 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Allergies
Toss and Turn

$300 Instant Gift⁴ with purchase of a mattress set.

Beautyrest Silver BRS900 11.75" Medium Firm Mattress

1769

Starting at

$1099⁹⁹

Medium Comfort, best for

Back, Side, Stomach Sleepers
Allergies
Bed Partner
Temperature
Pain
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest Silver BRS900-C 13.75" Extra Firm Mattress

1850

Starting at

$1999⁹⁹

Extra Firm Comfort, best for

Back, Stomach Sleepers
Temperature
Pain
Bed Partner
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Stearns & Foster Lux Estate Elite 16" Medium Euro Pillow Top Mattress

1020

Starting at

$4299⁰⁰

$4699⁰⁰

$400 OFF

Medium Comfort, best for

Back, Side, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

$300 Instant Gift⁴ with purchase of a mattress set.

Serta Perfect Sleeper Nurture Night 12" Firm Mattress

1237

Starting at

$999⁰⁰

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Nectar Classic 12" Firm Memory Foam Mattress

246

Starting at

$899⁰⁰

$1399⁰⁰

$500 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

Serta Perfect Sleeper Oasis Sleep 14.5" Pillow Top Mattress

1061

Starting at

$1399⁰⁰

Medium Comfort, best for

Back, Side, Stomach Sleepers
Pain
Temperature
Bed Partner
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Serta Perfect Sleeper Nurture Night 13.5" Medium Mattress

1069

Starting at

$1099⁰⁰

Medium Comfort, best for

Back, Side, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Serta Perfect Sleeper Oasis Sleep 12" Extra Firm Mattress

952

Starting at

$1399⁰⁰

Extra Firm Comfort, best for

Back, Stomach Sleepers
Pain
Temperature
Bed Partner
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest Black Series Two 16.5" Medium Pillow Top Mattress

301

Starting at

$3699⁰⁰

$4099⁰⁰

$400 OFF

Medium Comfort, best for

Back, Side, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

$300 ⁶ adjustable base instant gift with purchase.

Beautyrest Black Series Three 15.25" Medium Mattress

2394

Starting at

$4199⁰⁰

$4799⁰⁰

$600 OFF

Medium Comfort, best for

Back, Side, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

$300 ⁶ adjustable base instant gift with purchase.

Stearns & Foster Studio 14" Medium Mattress

1394

Starting at

$2299⁰⁰

$2499⁰⁰

$200 OFF

Medium Comfort, best for

Back, Side, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

Cyber Monday is an opportunity to compare California King size memory foam mattresses and find a balance of comfort, support and value that fits your bedroom. A standard California King mattress measures 72 inches wide by 84 inches long, giving taller sleepers four more inches of length than a standard king while taking up four fewer inches of width. Memory foam contours to your body and can help cushion pressure points around the shoulders and hips. Its ability to absorb movement may also help limit disturbances from a partner changing positions during the night. As you explore California King memory foam mattresses, consider your usual sleep position alongside your preferred feel. Side sleepers may appreciate more cushioning, while back and stomach sleepers may prefer a firmer surface that helps keep their bodies supported. Firmness descriptions vary by manufacturer, so compare each mattress’s construction rather than relying on its firmness label alone. Finding the right California King memory foam mattress on Cyber Monday means looking beyond the price to understand what each option offers. Compare comfort layers, mattress height and temperature-regulating features, especially if you tend to feel warm at night. Some models include gel-infused foam, ventilated layers or breathable covers designed to help manage heat, but construction and performance vary. Check that your bed frame or foundation provides the support required by the manufacturer, and confirm adjustable base compatibility if that feature matters to you. California King sheets and mattress protectors should match both the mattress dimensions and its depth for a secure fit. Before choosing a mattress at Mattress Firm, review the applicable delivery options, return or exchange terms and warranty details so you understand the full purchase. A thoughtful Cyber Monday mattress comparison can help you choose spacious, body-contouring comfort that suits your sleep preferences and budget without overlooking the practical details.

What should I compare when browsing memory foam mattresses on Cyber Monday? + -

Compare mattress construction, foam materials, firmness descriptions and cover care instructions. Keeping a short checklist of these details can make it easier to review options consistently.

What is memory foam made of? + -

Memory foam is a type of polyurethane foam with viscoelastic properties. Memory foam mattresses typically combine layers of this material with other foams or a coil base.

How do all-foam and hybrid memory foam mattresses differ? + -

All-foam mattresses use foam throughout their construction, typically pairing memory foam with a denser foam base. Hybrid memory foam mattresses combine memory foam layers with a coil base.

What does memory foam density mean? + -

Density measures how much foam weighs per cubic foot. It is different from firmness, so review density specifications and firmness descriptions separately when comparing mattresses.

Are memory foam mattress covers removable? + -

Some memory foam mattresses have removable covers, while others have covers sewn into place. A removable cover is not necessarily machine washable, so check the manufacturer's care instructions before cleaning.